The JI2C3800T4500N5 from JQL Electronics is a RF & Microwave Isolator with Frequency 3.8 to 4.5 GHz, Average Power Forward 50 W, Average Power Reverse 50 W, Insertion Loss 0.7 dB, Isolation 40 dB. Tags: Module with Connector, Coaxial Isolator. More details for JI2C3800T4500N5 can be seen below.